165618497 has 24 divisors (see below), whose sum is σ = 192572640. Its totient is φ = 141232320.

The previous prime is 165618493. The next prime is 165618503. The reversal of 165618497 is 794816561.

165618497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165618497 - 2² = 165618493 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165618493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 710693 + ... + 710925.

It is an arithmetic number, because the mean of its divisors is an integer number (8023860).

Almost surely, 2^165618497 is an apocalyptic number.

It is an amenable number.

165618497 is a deficient number, since it is larger than the sum of its proper divisors (26954143).

165618497 is a wasteful number, since it uses less digits than its factorization.

165618497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 442 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 165618497 is about 12869.2850228752. The cubic root of 165618497 is about 549.1651212062.

The spelling of 165618497 in words is "one hundred sixty-five million, six hundred eighteen thousand, four hundred ninety-seven".